Features: 1Easy to Use: Monaural business headset with 4 sections of single 3.5mm plug, which is in plug and play style and no driver is required. With USB sound card, it can support speaker volume adjustment, microphone mute and volume mute. 2Noise Reduction: Our telephone headset has a built in HD microphone which can be twisted at will, giving you clear sound effect and supporting conversations even in noisy environments. 3Durable Performance: Single sided ear headphone is made from rugged materials to ensure superb stability and durability. And the long headphone cable provides much flexibility when moving. 4Lightweight Design: Our telephone headset offers you a pleasant wearing experience at ease. Soft ear cushions and flexible headband will not burden your ears with any uncomfort. 5Wide Applicability: Works with devices with 3.5mm headphone jack, and with devices with USB ports when using a USB sound card. Ideal for home, offices, call centers, telemarketing, insurance, customer service, teleconferencing, etc. Package included: 1 x&nbspTelephone&nbspHeadset 1 x&nbspSound&nbspCard 1 x Instruction Manual